Article
The Harmonized System (HS) code decides the import duty, trade statistics and sometimes licensing for each product. Pipes, fittings and flanges fall under Chapter 73 (articles of iron or steel). The first six digits are common worldwide; countries add further digits for their own tariffs.
Main headings
| Heading | Covers |
|---|---|
| 7304 | Seamless tubes, pipes and hollow profiles of iron or steel |
| 7305 | Welded pipes with external diameter exceeding 406.4 mm |
| 7306 | Other welded tubes and pipes (up to 406.4 mm OD, and other profiles) |
| 7307 | Tube or pipe fittings: flanges, elbows, tees, reducers, couplings, sleeves |
| 7318 | Screws, bolts, nuts, studs and washers |
Common six-digit subheadings
| Product | Typical HS subheading |
|---|---|
| Seamless stainless pipe, cold drawn or cold rolled | 7304.41 |
| Seamless stainless pipe, other (hot finished) | 7304.49 |
| Welded stainless pipe, circular, up to 406.4 mm OD | 7306.40 |
| Stainless steel flanges | 7307.21 |
| Stainless threaded elbows, bends and sleeves | 7307.22 |
| Stainless butt welding fittings | 7307.23 |
| Other stainless fittings | 7307.29 |
| Carbon steel flanges | 7307.91 |
| Carbon steel butt welding fittings | 7307.93 |
Classification tips
- Classify by material (stainless vs other steel), construction (seamless vs welded) and product type.
- Large welded pipe above 406.4 mm OD moves from 7306 to 7305.
- Cast fittings are classified separately from forged and wrought fittings.
- Use the same code consistently on the invoice, packing list and shipping bill.
Important note
This table is a general guide. National tariff codes (8 to 10 digits) and interpretations vary, so the final classification should always be confirmed with your customs broker or the importing country's tariff before shipment.
Frequently asked questions
What is the HS code for stainless steel butt weld fittings?
Typically 7307.23 at the six-digit level, with national digits added by each country.
Which HS heading covers seamless pipe?
Heading 7304 covers seamless tubes and pipes of iron or steel.
Are flanges classified under 7307?
Yes. Stainless steel flanges are usually 7307.21 and carbon steel flanges 7307.91.
Key takeaways
- Chapter 73 covers steel pipes, fittings and flanges.
- 7304 seamless, 7305/7306 welded, 7307 fittings and flanges.
- Confirm national codes with your customs broker.
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